package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.constants.UserConstant;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.req.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.vo.LoginUserVO;
import com.yupi.yupicturebackend.model.vo.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import com.yupi.yupicturebackend.mapper.UserMapper;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author 小新
 * @description 针对表【user(用户)】的数据库操作Service实现
 * @createDate 2025-03-28 14:01:53
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
        implements UserService {

    /**
     * 用户注册
     * @param userAccount   用户账号
     * @param userPassword  用户密码
     * @param checkPassword 确认密码
     * @return
     */
    @Override
    public Long UserRegister(String userAccount, String userPassword, String checkPassword) {
        //1.参数校验
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数不能为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次密码不一致");
        }
        //2.账户不能重复
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        Long count = this.baseMapper.selectCount(queryWrapper);
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号重复");
        }
        //3.密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        //4.插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("暂无");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean result = this.save(user);
        if (!result) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "用户注册失败");
        }
        return user.getId();
    }


    /**
     * 用户登录
     *
     * @param userAccount
     * @param userPassword
     * @return
     */
    @Override
    public LoginUserVO UserLogin(String userAccount, String userPassword, HttpServletRequest request) {
        //1.参数校验
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数不能为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号错误");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码错误");
        }
        //2.密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        //3.查询用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount)
                .eq("userPassword", encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        if (user == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在,或者密码错误");
        }
        //4.设置用户登录态，并保存用户信息
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE, user);

        //5.返回结果
        LoginUserVO loginUserVO = getLoginUserVO(user);
        return loginUserVO;
    }

    /**
     * 用户注销
     * @param request
     * @return
     */
    @Override
    public boolean UserLogout(HttpServletRequest request) {
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null||currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);//移除用户的登录态
        return true;
    }

    /**
     * 用户密码加密
     * @param password 用户密码
     * @return
     */
    @Override
    public String getEncryptPassword(String password) {
        String SALT = "xiaoxin";//密码加盐
        return DigestUtils.md5DigestAsHex((SALT + password).getBytes());
    }

    /**
     * 获取登录用户信息(脱敏)
     * @param user
     * @return
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO userLoginVo = new LoginUserVO();
        BeanUtil.copyProperties(user, userLoginVo);
        return userLoginVo;
    }

    /**
     * 获取用户信息(脱敏)
     * @param user
     * @return
     */
    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user, userVO);
        return userVO;
    }

    /**
     * 获取当前登录用户信息列表(脱敏)
     * @param userList
     * @return
     */
    @Override
    public List<UserVO> getUserVoList(List<User> userList) {
        if(CollectionUtil.isEmpty(userList)){
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }

    /**
     * 获取当前用户
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        if (currentUser == null||currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        Long userId = currentUser.getId();//获取最新的对象
        User user = this.getById(userId);
        if (user == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        currentUser=user;
        return currentUser;
    }

    /**
     * 获取查询封装
     * @param userQueryRequest
     * @return
     */
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userName = userQueryRequest.getUserName();
        String userAccount = userQueryRequest.getUserAccount();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();

        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }

    /**
     * 判断当前用户是否为管理员
     * @param loginUser
     * @return
     */
    @Override
    public boolean isAdmin(User loginUser) {
        if(loginUser == null){
            return false;
        }
        return loginUser.getUserRole().equals(UserRoleEnum.ADMIN.getValue());
    }
}




